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-   -   Yet another loud GhettoBlaster (http://www.diyaudio.com/forums/everything-else/183086-yet-another-loud-ghettoblaster.html)

willek 13th February 2011 05:05 PM

Yet another loud GhettoBlaster
 
Here is my earlier blaster, built in 2009.

http://www.lanita.org/~willek/temp/Blaster/medn76.jpg

More story and building pictures here:
AllTheMods - Hardware Modding & Tuning Gallery


Altough this blaster served well enough, I wanted MORE sound. I started building this new blaster in the summer in 2010, and though it has been in use several times, it is not yet finished.

http://www.lanita.org/~willek/temp/B...06_Innards.jpg
http://www.lanita.org/~willek/temp/B...03_Battery.jpg

Drivers are Visaton BG 20. I chose them for their excellent sensitivity. Altough quite cheap, They offer real bang for the buck.
Amplifier is amp6 Basic from 41Hz.com. Digital and offers 2x15 W.
I chose lithium-ion batteries over NiMh or LiPo, since they are more carefree.
These are trustfire 18650 2500mAh 3,7V cells and in series they produce 14,8V which is ideal for the amp6.

http://www.lanita.org/~willek/temp/B.../01_Frame1.jpg
http://www.lanita.org/~willek/temp/B.../02_Frame2.jpg
http://www.lanita.org/~willek/temp/B...hirtasmold.jpg

The casing is 4mm plywood and fiberglass.

http://www.lanita.org/~willek/temp/B.../07_kiilto.jpg
http://www.lanita.org/~willek/temp/B...stelinelol.jpg
http://www.lanita.org/~willek/temp/B...ter2010/09.jpg
http://www.lanita.org/~willek/temp/B...ter2010/10.jpg
http://www.lanita.org/~willek/temp/B...ter2010/11.jpg
http://www.lanita.org/~willek/temp/B...ter2010/12.jpg

The main music player is an old internet tablet Nokia N800. I also added an USB/SD-card player which works with a remote.
And of course there is a plug for external players like cellphones.

http://www.lanita.org/~willek/temp/B...ter2010/13.jpg
http://www.lanita.org/~willek/temp/B...ter2010/14.jpg

Some leather ornaments and guard for the driver.

http://www.lanita.org/~willek/temp/B...ter2010/15.jpg
http://www.lanita.org/~willek/temp/B...ter2010/16.jpg
http://www.lanita.org/~willek/temp/B...ter2010/17.jpg

My original idea was to paint the blaster perly white with some car paint, but since I was in a hurry to get it ready, I used spray paint. On impulse I chose fluo yellow.
It came out quite aggressive :D

Comments?
Better color suggestions?

Cal Weldon 13th February 2011 05:52 PM

Excellent job Willek. The colour is just fine and the workmanship is commendable. I have been mulling around some ideas myself after the last one didn't quite cut it. Tell me please what cloth you use for forming the speaker area and how you laid up your fiberglass. Please include the weights, plies, resin, etcetera.

Thanks for showing us.

willek 13th February 2011 06:31 PM

The "cloth" is an old T-shirt. :D I guess it was cotton.
The resin is regular boat-stuff, styrene based polyesther resin.
There are 2-3 plies of fiberglass, but I think I sanded most of it off while trying to get it even. :)
If by weight(s?) you mean the whole blaster, it is some 8 kg.

kelticwizard 13th February 2011 10:16 PM

Breathes there a diy audio fan who does not have in the back of his mind building the biggest kickass blaster in history?

Looks like you've done it. Forming it out of fiberglass for that custom look really puts it in another class altogether. Looks like it came out of a factory with machine tooling, etc. Congratulations!

Cal Weldon 13th February 2011 11:22 PM

Quote:

Originally Posted by willek (Post 2467380)
There are 2-3 plies of fiberglass,

Hi Willek, thanks for the answers. By weight I was meaning the glass mat. I am supposing it is non-woven either 1 oz. or 2 oz.? And did you resin the shirt first and let it dry to get a surface on which to lay up your build up?

willek 14th February 2011 08:04 AM

Quote:

Originally Posted by kelticwizard (Post 2467618)
Breathes there a diy audio fan who does not have in the back of his mind building the biggest kickass blaster in history?

Looks like you've done it. Forming it out of fiberglass for that custom look really puts it in another class altogether. Looks like it came out of a factory with machine tooling, etc. Congratulations!

Thanks! :D

Quote:

Originally Posted by Cal Weldon (Post 2467681)
Hi Willek, thanks for the answers. By weight I was meaning the glass mat. I am supposing it is non-woven either 1 oz. or 2 oz.? And did you resin the shirt first and let it dry to get a surface on which to lay up your build up?

I dont actually know which weight it was, but definitely not woven. In retrospect, I think I should have used lighter mat since the surface came out so rough. And yes, I let theT-shirt harden with resin before applying the glass mat layers.

mr. doom 14th February 2011 03:23 PM

Stellar Job!

What did it cost and how much did it end up weighing?

willek 14th February 2011 04:36 PM

Quote:

Originally Posted by mr. doom (Post 2468310)
Stellar Job!

What did it cost and how much did it end up weighing?

Thanks!
Total cost was about 300 euros and final weight about 8 kg

AdamThorne 14th February 2011 05:39 PM

Looks killer! Don't change the color. Maybe a clear coat on it though. How long will it play? Looks like no separate tweeter, are you satisfied with the HF of the driver alone?

willek 14th February 2011 07:26 PM

Quote:

Originally Posted by AdamThorne (Post 2468448)
Looks killer! Don't change the color. Maybe a clear coat on it though. How long will it play? Looks like no separate tweeter, are you satisfied with the HF of the driver alone?

Yeah clearcoat crossed my mind though I have to redo the paintjob first. It was done in a rush and looks quite horrible on closer inspection. :)
I was actually suprised how well the Visaton drivers handle the high frequecies. It is well and beyond enough for the outdoors use this is designed for. :)
Playtime with full volume is about a day, and with medium volume easily a weekend. The N800 battery runs out well before the main battery :D


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